Rounding - practice for 13 year olds - last page
Number of problems found: 138
- Air
The room is 35.6 m long, 19.6 dm wide, and 591 cm high. How many people can simultaneously be in this room if, for hygiene reasons, is calculated 5000 dm³ of air per person? - Certificate
There are 31 students in a class. The mathematics score wasn't worse than 2. The average score in mathematics was 2. How many students have a score of one, and how many have a score of 2? - Tanks
The fire tank has a cuboid shape with a rectangular floor measuring 13.7 m × 9.8 m. Water depth is 2.4 m. Water was pumped from the tank into barrels with a capacity of 2.7 hl. How many barrels were used if the water level in the tank fell 5 cm? Wri - Tower
How many m² of the copper plate should be replaced on the roof of the conical tower shape with a diameter 23 m, and the angle at the axial section's vertex is 119°?
- N-gon II
What is the side length of the regular 9-gon circumscribed circle of radius 13 cm? - Addends
Number 681 divided into the two addends that the first was 9 greater than 60% of the second. Determine these addends. - Fertilizer
Mr. Gherkin uses for fertilization 10% solution of fertilizer. 5 liters of it still left. How much water must be added to the solution to make only the 7% solution? - Surveyor
Calculate the area of what may vary rectangular, if it focused by surveyor and found the dimensions 10 x 16 m while in each of the four joint points can be position deviation 8 cm? - Pure quadratic equation
Solve pure quadratic equation -7x² +4 = 0.
- Root
The root of the equation (x-10)² +4 = x² +35x is (equal or greater or less than zero). ... - Arc
Convert to arc measures (radians): 919 ° The result write as a multiple of π - Time
Write time in minutes rounded to one decimal place: 3 h 48 m 45 s. - Camel
Camel's owner wants to get out of the city into an oasis. He bought 3000 bananas, which he wants to sell in the oasis. However, an oasis from the city divided 1,000 kilometers of desert. Camel can carry up to 1000 bananas and eats one banana for every kil - Steps
How many steps do you save if you go square estate for diagonal (crosswise) rather than circumvent the two sides of its perimeter with 458 steps?
- Numbers
Determine the number of all positive integers less than 4183444 if each is divisible by 29, 7, 17. What is its sum? - Server
Calculate how many average minutes the web server is unavailable a year if the availability is 99.9%. - Rotating cone II
Calculate the area of the surface of a rotating cone with base radius r=15 cm and height h=13 cm. - Greek railwayman
Lewis works for the Slovak railways since 2000. His salary is 950 €. His colleague, Evgenias works in the Greek State Railways from 1984. Evgenias earns 5700 € per month. Calculate: a) how many times does Evgenias earn more than Lewis? b) how many times d
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